ChIP-Seq data for H3K27ac in both Dox OFF sarcoma cells (sarcoma cells without EWS/ATF1 expression) and wild-type MEFs28,29 revealed that EWS/ATF1 was recruited to H3K27-pre-marked regions in both sarcoma cells and sarcoma-iPSC MEFs (Fig. 7c and Supplementary Fig. 7f, g). Here, ATF1 is linked to sarcoma.